All southbound lanes are shut down tonight near the Bridgewater area of Route 287, after an overturned tractor-trailer leaked large amounts of fuel onto the highway, according to State Police.

"We're looking at least a couple of hours of closures," said police spokesman Sgt. Julien Castellanos, but said police only had preliminary information.

The truck overturned at around 10 p.m. tonight and began leaking diesel fuel. State Police as well as HAZMAT and local fire departments responded. Police are still investigating the cause of the accident and could not say tonight whether there had been any injuries or fatalities.

All southbound traffic was at a standstill by 11p.m. and police expected an extensive clean-up operation.